Provide a couple of quality-of-life usability improvements for Python bindings,
in particular:
* give access to the list of types for the list of op results or block
arguments, similarly to ValueRange->TypeRange,
* allow for constructing empty dictionary arrays,
* support construction of array attributes by concatenating an existing
attribute with a Python list of attributes.
All these are required for the upcoming customization of builtin and standard
ops.
Reviewed By: stellaraccident
Differential Revision: https://reviews.llvm.org/D110946
Enables putting types and attributes in sets and in dicts as keys.
Reviewed By: stellaraccident
Differential Revision: https://reviews.llvm.org/D110301
* NFC but has some fixes for CMake glitches discovered along the way (things not cleaning properly, co-mingled depends).
* Includes previously unsubmitted fix in D98681 and a TODO to fix it more appropriately in a smaller followup.
Differential Revision: https://reviews.llvm.org/D101493
